public string Login(string username, string password)
        {
            var _access = "false";

            try
            {
                using (var ctx = new Activos_FijoEntities())
                {
                    //var empleado = ctx.Empleados.Where();
                }
            }
            catch (Exception ex)
            {
                _access = $"Error: {ex.Message}.";
            }

            return(_access);
        }